Content Security Policy should dynamically support EKS without requiring manual configuration of the CSP

The current docs on adding EKS clusters make no mention of amending the gitlab_rails['content_security_policy'] for Omnibus installations.

If this value is left at the default configuration (EDIT: the default was changed, but this would be a problem with the configuration recommended in the documentation as well) then no details will load for the available roles/VPCs/etc. due to the default CSP settings:

Refused to connect to 'https://iam.amazonaws.com/' because it violates the following Content Security Policy directive: "connect-src 'self'".

In order to allow connections to AWS the following must be added to gitlab.rb:

gitlab_rails['content_security_policy'] = {
  'directives' => {
    'connect_src' => "'self' '.amazonaws.com'",
  }
}